论文部分内容阅读
直喷式天然气发动机缸内喷雾发展和动态混合历程是实现高效清洁燃烧的关键.基于定容燃烧弹可视化纹影试验系统,分析了缸内温度、缸内压力、喷射压力等参数对直喷式天然气发动机喷雾动态特性的影响规律.结果表明:缸内压力和喷射压力对天然气喷雾发展历程产生显著影响,随着缸内压力变大,喷雾贯穿速度相对变慢,喷雾扩散锥角变大;喷射压力越大,喷雾贯穿速度越快,喷雾扩散锥角越大.缸内温度对喷雾发展影响相对较小.“,”Jet development and mixing process of natural gas direct injection engine are the key to achieve high efficiency and clean combustion.This research worked on the characteristic of directly injected natural gas spray in cylinder based on a combustion bomb with a schlieren test system.The influence on direct injection natural gas engine spray dynamic characteristics was systematically analyzed by the ambient temperature,ambient pressure,injection pressure and other parameters.The results showed that the ambient pressure in combustion chamber and the injection pressure highly influenced the jet spray development process.With the enlargement of ambient pressure,the spray penetration rate compared to slow,while the spray cone angle diffusion increased;the greater the injection pressure,the expedited the spray penetration,and the more amplified,the spray diffusion cone angle.In addition,the study shows that the influence of cylinder temperature on the develooment of the sorav is relativelv small.